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(No Model.)

J. D. EVANS. GRINDING MILL. No. 544,294. Patented Aug. 13, 1895.

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J. D. EV GRINDING No. 544,294 v Patented Aug. 13, 1895.

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J OHN D. EVANS, OF ST. LOUIS, MISSOURI.

GRINDING-MILL.

sPEoIFIoATIoN forming part of Letters Patent N 544,294, dated August 13, 1895.

Application filed March 4,1895. Serial No. 540,498. (No model.)

To all whom it may concern.-

Be it known that I, JOHN D. EVANS, of the city of St. Louis, State of Missouri, have invented certain new and useful Improvements in Grinding-Mills, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention relates to an improved grind-' ing-Inill; and it consists in the novel construetion, combination, and arrangement of parts, hereinafter specified and claimed.

In the drawings, Figure 1 is a side elevation of a grinding-mill constructed in accordance with my invention, one of the drivingpulleys being removed therefrom to more clearly illustrate the device. Fig. 2 is a top plan View of one of my improved grindingmills. Fig. 3 is a detail horizontal sectional view taken approximately on the indicated line 3 3 of Fig. 1. Fig. 4 is a cross-sectional view taken approximately on the indicated line 4 4 of Fig. 2. Fig. 5 is a detail sectional view showing one of the forms of corrugations I use on the disks of myimproved mill. Fig. 6 is a detail vertical sectional view taken approximately on the indicated line 6 6 of Fig. 2.

Referring by numerals to the accompanying drawings, 1 1 indicate the bases of the side frames of my mill, the same being provided with extending feet 2, whereby said bases are rigidly bolted to a framework or floor. End blocks 3 and 4 are provided with rectangular ears 5 that rest in rectangular notches or cutaway portions 6 in the upper and outer corners of the bases 1, and said end blocks 3 and 4 are, by means of bolts 7 or in any suitable manner, very rigidly bolted to the ends of the bases 1.

Top bars8 are very rigidly fixed by bolts 9, or in any suitable manner, to the upper ends of the end blocks 3 and 4. Located in the 1ongitudinal centers of the top bars 8 and bases 1 and extending vertically therethrough are rectangular coinciding apertures 10. Formed in the top faces of the bases 1 and extending from the centrally-arranged aperture 10 therein to the end blocks 4 is a rectangular channel 11, and formed in the under sides of the top bars 8 and extending from the rectangular aperture 10 therein to the end blocks 4 are rectangular channels 12 that are identical inform and'size with the channels 11.

Passing through horizontally arranged screw-threaded apertures 13 in the end blocks 4 are headed screw-bolts 14, the same being provided with conical bearing-points 15.

Rigidly fixed between the bases 1 and top bars 8 and adjacent the end blocks 3 are split bearing-boxes 16, the same being of such a width as to completely fill the space between the end blocks 3 and the vertically-aligned apertures 10 in the top bars 8 and bases 1. Passing through these vertically-aligned apertures 10 are keys or wedge-blocks 17'that are held for vertical adjustment in said apertures by screw-bolts 18 that pass through the sides of the top bars 8 and bases 1 and engage directly upon the outer faces of the keys 17.

Split bearing-boxes 19 are located between the top bars 8 and bases 1 on the opposite sides of the keys 17 from the bearing-boxes 16, and said bearing-boxes 19 are constructed on their top and bottom edges with longitudinally-extending tongues 20 that engage in the channels 11 and 12 in the bases 1 and top bars 8.

Bearing plates 21 are located directly against the faces of the bearing-boxes 19, adjacent the end blocks 4, and said bearingplates 21 are constructed with conical recesses 22 in their outer faces in which the conical bearing-points of the headed bolts 14 engage. The faces of the bearing-boxes 16 and 19 that engage against the keys 17 are also provided with bearing-plates, such as 23, the faces of the bearing-plates of the boxes 19 being slightly Wedge-shaped in order to coincide with the saidkeys 17.

Journaled in the oppositely-arranged bearing-boxes 16 is a shaft 24, the same extending a slight distance beyond the frame on one side of the device, and having a drivingpulley 25 rigidly fixed thereon. Journaled in through which the shaft 24 passes, and there Ico has rigidly fixed a driving-pulley 27. The periphery of the shaft 24 between the side frames is constructed with a left-hand screwthread and the body of the shaft 26 between the side frames is constructed with a righthand screw-th read.

The grinding-disks 28, of which I make use, are of the uniform thickness and diameter, and are provided with the centrally-arranged apertures 29, the apertures of the disks that are to be located upon the shaft 24 being properly threaded, so that they may be readily located upon said shaft, and the disks that are located upon the shaft 26 so threaded that they may be properly located upon said shaft. These grinding-disks 28 are V-shaped in cross-section from their screw-threaded apertures to their peripheries, and the faces of said disks are constructed with minute corrugations 30 that extend from the screwthreaded apertures 29 in said disks tangentially, or in curved radial lines from the centers of said disks to the edges thereof. \Vhen the disks 28 are properly located upon the shafts 24 and 26, the same will alternately mesh with one another, and a series of approximately oval grinding-surfaces between said disks will be formed. The peripheries of each disk extend almost to the shaft upon which the opposite disks are mounted. As the shafts 24 and 26 rotate toward one another, and in the direction of the arrows in Fig. 4, the disks will tend to be automatically tightened, and the threads upon the shafts being in proper relation to the threads of the disks it will be seen how said disks will tend to tighten themselves upon the shafts while the mill is running.

Longitudinal adjustment for the shaft 26 and disks thereon relatively to the shaft 24 and disks thereon is obtained by means of the wedge-blocks 17 and the screw-bolts 14. To adjust said shaft 26 and the disks thereon the screw-bolts 18 and 14 are loosened. The bearing-boxes 19 are now moved longitudinally between the top bars 8 and bases 1 until the shaft 26 carried by said bearing-boxes and disks upon said shaft are in proper location relatively to the shaft 24 and disks thereon. The keys 17 are now raised or lowered until the same contact with the faces of the bearing-plates 23 adjacent the bearings 19 and the screw-bolts 18 are tightened or so manipulated as to rigidly hold the said keys in the desired position. The screw-bolts 14 are now manipulated until the cone-shaped bearingpoints 15 engage in the conical recesses 22 in the bearing-plates 21. Thus perfect adjustment for the shaft 26 and disks thereon is obtained.

The grain or other commodity to be ground is fed directly onto and between the disks 28 that are rotating toward each other and at the proper speed. As said grain or commodity passes between said disks it will be engaged by the corrugations upon said disks and be thoroughly ground in the proper manner. By slightly altering the form or size of the corrugations upon the disks the commodity passed through the mill may be either split or rolled.

A grinding mill of this construction is adapted for all classes of cereals, spices, coffee, rice, or any of the various commodities that are usually ground or pulverized before being used.

A grinding-mill of this construction presents a large grinding-surface in a very coinpact space, is operated with a minimum amount of power, and possesses superior advantages in point of simplicity, durability, and general eificiency.

\Vhat I claim is In a grinding-mill, the combination of two parallel shafts mounted in suitable bearings, one of said shafts being provided with a continuous right-hand screw-thread and the other one of said shafts being provided with a continuous left-hand screw-thread, and a series of separate grinding-disks mounted upon said shafts, whereby when the latter are revolved toward each other, said disks will tend to antomatically lock themselves in position, substantially as herein specified.

In testimony whereof I atfix my signature in presence of two witnesses.

JOHN D. EVANS.

Witnesses:

EDWARD E. LONGA'N, J OI-IN O. HIGDON. 

